<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .bw1{
            float: left;
            width: 200px;
            height: 200px;
            background-color: orange;
        }
        .bw2{
            float: left;
            width: 400px;
            height: 200px;
            background-color: red;
        }
        .bw3{
            float: left;
            width: 400px;
            height: 200px;
            background-color: green;
        }
        .bw4{
            /* float: left; */
            width: 400px;
            height: 300px;
            background-color: rgb(40, 20, 214);
        }
        .bw5{
            float: left;
            width: 400px;
            height: 200px;
            background-color: green;
        }
        .bw6{
            float: left;
            width: 400px;
            height: 200px;
            background-color: green;
        }


    </style>
</head>
<body>
    <!-- 标准流就是这样 -->
    <div class="bw1">111</div>
    <div class="bw2">222</div>
    <div class="bw3">333</div>

    <div class="bw4">444</div>
    
    <div class="bw5">555</div>
    <div class="bw6">666</div>
    <!-- <div class="bw4">444</div> -->
</body>
</html>